8it用法总结0803

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1、“It”用法及其句型和固定搭配讲解“It”用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点，因此应给予充分的重视，现将it用法归纳如下：一、It用作实词表达以下概念：指代前文提到的事物，前文中的this，that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象……二、It用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。It作形式主语的常见句型：1.

2、代作主语的动词不定式，其句型为（1）Itbeadj.（forsb.）todosth.此处adj.通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，wrong，important，unimportant，legal，illegal，well-mannered，ill-mannered，polite，impolite，clear，obvious，certain，s

3、uitable，proper，fit，useful，useless，dangerous…例 Itisillegal（forateenager）todriveacarwithoutalicense.（2）Itbeadj.ofsb.todosth.此处adj.通常为描述人的形容词：kind，unkind，nice，rude，cruel，considerate，thoughtful，thoughtless，careful，careless，silly，foolish，stupid，clever，wise，

4、crazy.例 It'skindofyoutohelpmewiththeproblem.（3）It替代作主语的动名词的常见句型It'snogood/usedoing…It's（well）worthdoing…It's（well）worthone'swhiledoing/todo…It's（well）worthwhiledoing/todo例 It'snousecryingoverspiltmilk.2.It替代作主语的从句常见句型（1）Itis+noun+从句例 Itisnosecretthatth

5、epresidentwantstohaveasecondtermatoffice.（2）Itisadj.+clauseIt'ssurprisingthat…（should）… ……竟然……It'sapity/shamethat…（should）… ……竟然……例 It'simportantthatyoushouldapologizetoherforyourrudeness.（=It'sofmuchimportancethatyoushouldapologizetoherforyourrudeness

6、.）（3）Itverbsb.+clause=Itisv-ing+clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/angersb.that…例 Itworriedmethatshedrovesofast.（=Itwasworryingthatshedrovesofast.）（4）Itverb（tosb.）that…=sb/sthverbtodo（

7、verb=appear，seem，comeabout，emerge，follow，chance，happen，occur，transpire，turnout，workout）例 It（so）happened/chancedthattheywereout.（=Theyhappened/chancedtobeout.）（5）Itisv-edthat…=sb/sthistodo（verb=say，report，think，believe，hope，expect，agree，accept，decide，de

8、termine，intend，plan，understand，know）例 Itissaidthatthecouplehavegottendivorced.（=Thecouplearesaidtohavegottendivorced.）（6）Itisv-edthat…（should）…（verb=demand，request，require，order，suggest，advise，recommend例 Itissuggestedthattheyshouldbegin